cannot save 'additoinal' additional parameters in enigmail

i want to add the following into thunderbird 24.0.1 and enigmail 1.6

personal-cipher-preferences TWOFISH,AES256,CAMELLIA256,BLOWFISH,AES,AES192,CAMELLIA128,CAMELLIA192

personal-digest-preferences SHA512,SHA384,SHA256,SHA224

but each time i restart TB these are removed most likely by torbirdy 0.1.1

can this be changed to allow so ?

using linux mint 13 (precise ubuntu) amd-64 2013-10-24 04:59:09.834 [DEBUG] enigmail.js: detected GnuPG version '2.0.22'

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Username: johnshaft